Let me just get right to it with a screenshot:

The shot shows that under only a couple hours of runtime, SideKick has written ~42GB of data to my C drive which happens to be a Solid State Drive for me and more and more people nowadays. It is well known, that SSD's have a limited number of writes.
Since we cannot even change the install destination of SideKick (nor language but that's another story), it means that it's decreasing SSD's life expectancy continously by a lot.
It simply wasting SSD's.